diff --git a/README.md b/README.md
index e15ecd1..f92c18e 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,19 @@ dataPacker({
 })
 ```
 
+You can use functions as values of `dest.path` and `dest.path.map.annotation`. This functions must return strings.
+Example (from #13):
+
+```js
+dataPacker({
+	dest: {
+		path: function (opts) {
+			return path.join('build/css', path.basename(opts.from, '.css') + '.data.css');
+		}
+	}
+})
+```
+
 
 ### Using
 
diff --git a/README.ru.md b/README.ru.md
index 14029e0..b2b232f 100644
--- a/README.ru.md
+++ b/README.ru.md
@@ -90,6 +90,19 @@ dataPacker({
 })
 ```
 
+Значениями параметров `dest.path` и `dest.path.map.annotation` также могут быть функции, которые должны возвращать строку.
+Пример использования (из #13):
+
+```js
+dataPacker({
+	dest: {
+		path: function (opts) {
+			return path.join('build/css', path.basename(opts.from, '.css') + '.data.css');
+		}
+	}
+})
+```
+
 
 ### Подключение
 
diff --git a/index.js b/index.js
index d3988d9..379bd9a 100644
--- a/index.js
+++ b/index.js
@@ -179,7 +179,7 @@ function generateDataFile (css, opts) {
 
 	var data = dataCSS.toResult({
 		to: (typeof opts.dest.path === 'function') ? opts.dest.path(opts) : opts.dest.path,
-		map: (typeof opts.dest.map === 'function') ? opts.dest.map(opts) : opts.dest.map
+		map: opts.dest.map
 	});
 
 	if (!data.css.length) return;
@@ -201,6 +201,7 @@ function extend (target, source) {
 	Object.keys(source).map(function (prop) {
 		prop in a && (a[prop] = source[prop]);
 	});
+	
 	return a;
 };
 
@@ -241,7 +242,8 @@ function getMapPath (opts) {
 	var result;
 
 	if (opts.map.annotation) {
-		result = path.dirname(opts.to) +'/'+ opts.map.annotation;
+		result = (typeof opts.map.annotation === 'function') ? opts.map.annotation(opts) : opts.map.annotation;
+		result = path.join(path.dirname(opts.to), result);
 	}
 	else {
 		result = opts.to +'.map';
diff --git a/package.json b/package.json
index ebefba9..1f1b1d8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "postcss-data-packer",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "description": "PostCSS plugin to move an embedded data into a separate file",
   "keywords": [
     "css",